<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>媒体查询</title>
    <style>
        .box {
            height: 100px;
        }
        
        @media screen and (max-width:768px) {}
        
        @media screen and (min-width:768px) and (max-width:992px) {}
        
        @media screen and (min-width:992px) and (max-width:1200px) {}
        
        @media screen and (min-width:1200px) {}
    </style>
</head>

<body>
    <div class="box">
        hello
    </div>
</body>

</html>